If you're having trouble sitting still long enough to get into a relaxed meditative state, try chanting a mantra at first

I'm a big fan of the Maha Mantra:

Hare Krsna Hare Krsna
Krsna Krsna Hare Hare
Hare Rama Hare Rama
Rama Rama Hare Hare

You don't have to be Hindu or believe in Krsna to benefit from this mantra